Blindstitching-machine for felling.



T. J. HAYES. BLINDSTITCHING MACHINE FOB FELLIN G" APPLICA'I 'IOM FILED APR. 9. 914.

Patented Feb. 5, 1918-.

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1 J. HAYES. BUNDSTITCHLNG MACHINE FOR FELLING.

a APPLICATION men mm, 1914.

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T. J. HAYES. BLINDSTITCHING MACHINE FOB FELLING.

I APPLICATION FILED APR. 9, I914. Jlfifi5fi15n Inventor. Thomas J. Huyes,-

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7; Thomas HOIYES,

% YMWAZW T. J, HAYES. BLINDSTITCHING MACHINE FOR FELLING. APPLICATION FILED APR-9,1914.

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' Inventor.

Patented Feb. 5,- 1918.

tinirnn erarne arena that THOMAS J. HAYES, OF ROSLINDALE, MASSACHUSETTS, .ASSIGNOR TO ABBETTER FELL- ING MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

BLINDSTITCI-IING-MACHINE FOR FELLING.

ma am.

if Specification of Letters Patent.

Patented Feb.5, 19in.

Application filed April 9, 1914. Serial No. 830,789.

To all whom it may concern:

Be it known that'l, THOMAS J. HAYES, a citizen of the United States, and resident of Roslindale; county of Suffolk, State of lvlassachusetts, have invented an Improvemont in l5liudstitching-ll/lachines for Fell- :ing,'of whichthe following description,.in connection with the accompanying drawing, is a specification, like characters on the drawing representing likeparts.

This invention relates to improvements in machines for doing blind stitching work for felling in which a superimposed layer of fabric is secured to a-lower or base layer by means of two parallel lines of stitching, one of which passes through the lower portion of the superimposed fabric without appearing uponthe upper surface thereof and the other of which passes through'the up per surface of the lower layer of fabric without iienetrating itslower surface so that when the stitches are set the line of stitching connecting the two layersof fabric will be substantially or entirely concealed' This invention comprises means for causing an oscillating movement of a curved needle in a plane parallel to the plane of the work support whereby the needle may be thrust well beneath the edge of the super imposed layer in order to insure the concealment of the" line of stitching uniting the upperlayer to the base layer of the fabric. It also comprises means for causing the oscillating needle to penetrate and to emerge from the fabric at points in the same plane, which parallel to the plane of the work support so that the stitches can be laid in the superimposed fabric without distortion of the edge thereof, when the stitch i drawn up.

Another feature of the invention consists in providing means for supporting the oscillating needle rigidly and for vibrating the same laterally to produce parallel rows of stitches in such a manner that there is no likelihood of undesired vibration of the needle which will cause the misplacing of stitches in the fabric.

Otherobjects of the invention will more fully appear from the following description and accompanying drawings and will be more fully pointed out in the appended claims.

Figure 1 is a side view partly'in section of a blind stitch sewing machine embodyelevation.

Fig. 5 is a detail side elevation of the needle actuating mechanism and presser foot.

Fig. 6 is a detail front view of the same.

Fig. 7 is a detail plan view of the needle actuating mechanism and presser foot showing the needle in position in which it ongages the superimposed layer of fabric in blind' stitching.

Fig. 8 is a detailplan view showing the needle in the position in which it engages the lower or base layer of the fabric.

The preferred embodiment of my invention illustrated herein comprises a bed plate 1, havinga suitable work support 2 ad justably arranged relatively thereto, and adapted 'to-beraise'd and'lowered by the usualhand or knee lever a substantially cylindrical. standard 3, and a horizontal arm 4 extending from said standard parallel to thebed plate and having at its front end a head?) inclosing the actuating mechanism for a curved oscillating needle and comple mental stitch forming mechanism.

The arm is provided with suitable hearings 6, 7 and 8 for the main shaft 10 which dis-posed'axially of saidarm and is provided at the rear end with the usual driving pulley 11 and hand wheel 12 which may be secured thereon in the usual manner. The forward endof the shaft 10 is provided with a spiral gear 13 which engages an idler l4 suitably mounted in the head of the machine and which in turn en 'a es a s airal ear 15 which is secured to the upper end of an annularl disposed shaft 16- which drives the revolving hook or looper. By the use of an intermediateidle spiralgear provision is made for inclosingthe-shaft 16 and the gear for driving the revolving hook in the head of the machine, the bearing 17 for said shaft preferably projecting inwardly from the side of the head, and the lower bearing 18 being formed in the-lower casing of said head. The lower portion of saidhead is preferably provided with an extension 19 having a journal 20 .to adaptit to receive the shaft 21 of-the revolving hook or looper 22. A curved cap plate 23 may be secured to said projection to inclose the beveled gears 25 and 26 which are secured respectively to the shafts l6 and 21, and through which rotation is imparted fromthe shaft 16 to the revolving hook.

V In the preferred embodiment of the inportion of the head of the sewing machine.

Thev carriage 30 is preferably provided with upward and downward cyhndrical extensions or bosses 35, and 36, these bosses and V the carriage being bored to form a journal for a vertical needle shaft 37.

The needle shaft 37 may be provided at its lower end with a collar 38 preferably having an integral lateral and downwardly extending arm,or needle bar 39 slotted and recessed at is end 40 to receive the shank of a curved needle.

The needle shaft 37 may be provided at its upper end with a'collar 41 having a laterally 7, extending arm 42 connected to a link 43 which in turn is connected to the arm 44 of V a rock shaft 45 mounted. in suitable vertically disposed bearings46 and 47 projecting inwardly from the side ofthe head, the

shaft 45 being provided with an upper arm 7 48 ccnnected by a ball and-socket joint 49 to the arm of a cam strap 50 which em-- braces suitable cam 51 carried by the main shaft adjacent to its front end. It will be observed that by the foregoing arrangement I the lateral vibration arm 48, caused by. the

cam 51 oscillates the rock shaft 45, which in turn oscillates the needle shaft 37 and needle to cause thelatter to move in a horizontal arcuate path. 7 V I A needle guide preferably, is provided to steady the needle and prevent vibration or deflection thereof which would result in snagging thefabric. A preferred form of needle guide which is lllustrated in Figs. 5,

6, and 8 of thevdrawing comprises a needle I guiding infstrumentality52 preferably forming an integral part of an arm 52* which ex tends downwardly and laterally from a split collar 53 which is clamped by a set screw 54 upon a boss 36 projecting downwardly from the carriage30.. Inasmuch as this needle guide is carried by the needle bar supporting carriage it partakes of the movement thereof and with the needle enters beneath the superimposed layer and raises it, thus preventing the needle from catching 1n the layer before it has reached the position in which it is intended to be thrust into said layer.

The lateral or shogging movement is imparted to the needle through a lever 55 which is forked at its lower end to engage a stud 56 projecting laterally from an upstanding ear 57 integral with the carriage 30, the upper end of said lever 55 being pivoted upon a stud 58 projecting inwardly from the side of the sewing machine head.

,The lever 55 is provided intermediate of its ends with an offset portion 60 carrying a vertical stud 61 having a spherical head 62 seated in a suitable socket in the end of a floating lever 63 which is actuated from a cam 64 preferably carried by a vertical counter shaft 65 driven from the main shaft 10, in the ratio of two to one.

The floating lever 63 is preferably provided with an adjustable section 66 which may be secured thereto by bolts 67 passing through suitable slots in a lever 63, tie portion 66 of the lever being provided at its rear end with a yoke 68 which embraces the cam 64.

In order to provide longitudinal movement to reciprocate the carriage for the needle bar, the lever 63-66 is provided with a stud 69 which is pivotally attached to a link 71 which in turn is attached to the end of an arm of a bell crank lever suitably pivoted at it's elbow 72 upon a boss 73 extending downwardly from the middle of the sewing machine arm, the pivotal connection at the end of the arm 7 0 thus forming a movable fulcrum for said lever. The other arm 74 of the bell crank lever is provided with an extension 75 which projects through a suitable slot in the casing of the arm and is provided at its outer end with a milled clamping nut 76. The walls of the slot are preferably made in arcuate form to provide ways 77 against which the milled nut 76 may be clamped to hold the bell crank lever in adjusted position. By the construction above described the fulcrum of the lever 6366 lateral or shogging movement to the.

needle, and the adjustment of the bell crank lever aforesaid provides means for determining the amplitude of the movement of said carriage and for varying the distance between the parallel rows of stitching.

The presser foot preferably comprises a horizontal base portion -having a forward upwardly curved extension or toe 91, the latter being apertured near its junction with the body of the foot to form a throat opening 92' through which the material of the lower layer of fabric may be projected in order that'the needle may penetrate the same, and

an offset or lateral raised portion 94 eX- tending in a plane parallel to but above the plane of the base portion.

The body portion of the presser foot may be provided on its under surface at one side with a rib 93 to rest upon-the lower or base layer of the fabric. The lower surface of the lateral raised portion of the presser foot is preferably disposed in substantially the same plane as the upper surface 95 of the base portion of-the presser foot. The offset or web 96 which unites the lower or base portion 90 of the presser foot with the raised portion '94- preferably being cut away at and beyond the throatopening as at 97 to provi de a path for the oscillating needle.

In operation the lower or base layer of fabric is fed across the work support in the usual manner. The superimposed layer is introduced at the side of the base portion of the presser foot and passes under the raised portion, the offset forming a guide for the edge thereof. The cut away portion of the web permits the needle, which oscillates in a horizontal plane or in a plane parallel to the work supporting surface of the work support to enter well beneath the superimposed layer of fabric and to'enter and emerge from said fabric in the same horizontal plane thus avoiding any rolling of the edge of the superimposed fabric when the stitch is drawn up by the takeup, and forming a stitch which. will be well concealed when the lines of stitching are completed.

The line of stitching" in the lower or base layer of fabric isproduced in the usual manner by shogging the needle laterally and projecting a portion of the layer of fabric into the path thereof by means of a bender or equivalent mechanism.

The stitch forming-mechanism illustrated herein may cooperate with any suitable mechanisms for feeding the material and for bending the lower layer of fabric into the path of the oscillating needle. I have,

however, shown special feeding and bender mechanisms herein but inasmuch as they do not form an essential part of the invention claimed herein it is unnecessary to describe the same in detail herein. It may, however, be stated that the feeding mechanism is preferably actuated from cams 101 and 102 carried by the main shaft in the rear end of the machine which actuate links 103, 1-04 pivotally connected at their respective lower ends to the arms of rock shafts 105 and 106 which in turn are connected to suitable mechanism at the front end of the machlne for ra sing and lowering, and for advancing and retracting the feed dog 110.

The bender mechanism illustrated herein is preferably driven from the vertical counter shaft 65 through ahorizontal shaft 120 to which it is connected by beveled gears 121, 122, said shaft 120 being provided at its opposite end with an arm 1% which is connected by a link 125 to an arm 126 of a rock shaft 127 which is disposed in parallelism with shaft 120 but in a plane at one side of the plane of the axis thereof so that the rock shaft 127 is given a differential movement durin its rotation.

The shaft 127 in the preferred form of the invention shown herein is provided with a earn 128 which actuates a yoke 129 connected by suitable means with the bender 130. The

cam 128 is preferably of a special type adapted to dwell while the bender 1s in extreme upper position to permit the needle to enter well into the fabric and the differential arrangement between the shafts 127 and 120 is such as to cause a rapid withdrawal of the bender to avoid interference with the operation of the feed mechanism. This, however, forms subject matter of another application and is not therefore a portion of the invention sought to be claimed herein.

Any suitable form of take up mechanism may be utilized in connection with this invention. I have, however, illustrated a convenient type of take up which comprises a bell crank lever 140 pivoted upon a lug Lil on the inner side of the sewing machine arm, one end of the bell crank lever being provided with an offset portion 14:2 having a thread engaging loopor guide, the other arm 14st of the lever being provided with a stud 145 adapted to enter the slot 146 of a cam 147 suitably secured to the main driwing shaft.

It is to be understood that the embodiment of the invention shown herein is illustrative merely and. is not restrictive and that my invention comprehends any mechanism for oscillating a curved needle in a plane parallel to the plane of the work support and means for giving the needle a lateral or shogging movement in the plane in which it oscillates.

comprising a work support, a curved oscillating needle and complemental stitch forming mechanism, means for feeding the Work across the work support and means for presenting the needle with the plane ofits oscillation. in the penetrating stroke parallel to .the work supporting surface of the work support.

2. A sewing machine for blind stitching comprising a work support, a curved oscillating needle and complemental stitch forming mechanism, means for feeding the work across the work support, means for presentingthe needle with the plane of its oscillation in the penetrating stroke parallel to the work-supporting surface of the work support and with the mean radial line of its arc of oscillation normal to the line of feed.

3. A sewing machine for blind stitching comprising a work support, a curved oscillating needle and complemental stitch forming mechanism, means for feeding the work across the work support, means for presenting the needle with the plane of its oscillation in the penetrating stroke parallel to the work supporting surface of the work support and means for vibrating the needle laterally to produce two rows of stitches whereby the needle while making both of said rows of stitcheswill oscillate in its penetrating stroke in a plane parallel to the Work supporting surface of the work support.

a. In a sewing machine for blind stitching comprising a work support, a curved oscillating needle and complementary stitch forming mechanism located above the work support, means for producing a relatively lateral vibration between the work support and the needle to produce two rows of stitch- .ing, means for presenting the needle with its plane of oscillation parallel to the work i supporting surface of the work support, and

meansfor holding and directing the edge of the superimposed layer so that the points of penetration and emergence of the needle will be in the same plane parallel to the work supporting surface of the work support.

5. In a sewing machine for blind stitching comprising a work support, acurvedoscillating needle and complementary stitch formingmechanism located above the work support, means for producing a relatively lateral vibration. between the work support and the needle to produce two rows of stitching, means for presenting the needle with its plane of oscillation parallel to the plane of the work supporting surface of the work support and means for holding and guiding the edge of the superimposed layer of material at the stitching point, comprising a presser foot having a needle throat, an offset portion adjacent thereto forming an edge guide for the superimposed layer and having a cut away portion to permit the oscillating needle to enter and emerge beneath the upper edge of said superimposed layer.

6. A sewing machine of the class described comprising a work support, a curved oscillating needle and complemental stitch forming mechanism, means for feeding the work across the work support, means for support ing said needle with its plane of oscillation parallel to the work supporting surface of said work support comprising a needle shaft the axis of which is normal to the plane of the work support, a needle bar and needle extending laterally therefrom and means for oscillating said shaft.

7. In a sewing machine for blind stitching comprising a work support, a curved oscillating needle and complcmental stitch forming mechanism located above the work support and means for feeding the material over said work support, means for supporting the needle to oscillate in a plane parallel to the plane of the work support, means for vibrating the needle laterally to form two rows of stitches comprising a carriage mounted above the bed plate and movable in a plane parallel thereto, a needle shaft.

mounted in said carriage in a plane normal 00 to the work supporting surface of the work support and means for actuating said carriage and means for oscillating said shaft.

8. In a sewing machine for blind stitching comprising a work support, a curved oscillating needle and complemental stitch forming mechanism located above the work support and means for feeding the material over said work support, means for supporting the needle to oscillate in a plane parallel. to the no work supporting surface of the work support, means for vibrating the needle laterally to form two rows of stitches comprising a sliding carriage mounted in ways in the lower portion of the sewing machine head to reciprocate in a plane parallel to the plane of the work support, a shaft journaled in said carriage with its axis normal to the plane of the work support, a needle bar thereof, means for oscillating said shaft and means for reciprocating said carriage.

9. In a sewing machine for blind stitching comprising a work support, a curved oscillating needle and complemental stitch formto the work supporting surface of the work secured to said shaft adjacent to the end 120 support, means for vibrating the needle laterally to form two rows of stitches comprising a sliding carriage mounted in ways in the lower portion of the sewing machine head to reciprocate in a plane parallel to the plane of the work support, a shaft ournaled in said carriage with its axis normal to the plane of the Work support, a needle bar secured to said shaft adjacent to the end thereof, means for oscillating said shaft, means for reciprocating said carriage and means for adjusting the amplitude of movement of said reciprocating carriage to vary the distance between the parallel rows of stitching.

10. In a sewing machine for blind stitching comprising a work support, a curved oscillating needle and complen'iental stitch forming mechanism located above the work support and means for feeding the material over said work support, means for supporting the needle to oscillate in a plane parallel to the work supporting surface of the work support, means for vibrating the needle lat orally to form two rows of stitches comprising a sliding carriage mounted in ways in the lower portion of the sewing machine head to reciprocate in a plane parallel to the plane of the work support having a downwardly disposed extension, a needle shaft journaled in said carriage and extension with its axis normal to the plane of the work support, a needle bar and needle secured to said shaft, a needle guide carried by said extension, means for oscillating said needle shaft, and means for reciprocating said carriage whereby the needle guide will serve to steady and direct the needle in both of its penetrating strokes.

11. In a blind stitch sewing machine for felling a superimposed layer upon a base layer of material comprising a work support, a curved oscillating needle and complemental stitch forming mechanism located above the Work support and means for feeding material over said work support, needle actuating mechanism comprising a needle bar, means for supporting the needle bar to permit lateral vibration, means for vibrating said needle bar laterally to form two rows of stitches and a needle guide carried bar, a sliding carriage for supporting the needle bar to permit lateral vibration, means for vibrating said carriage laterally and a needle gulde carried by said carriage and movable therewith adapted to enter beneath the superimposed layer and steady and direct the needle during its oscillation.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

THOMAS J. HAYES.

I/Vitnesses FREDERICK A. TENNANT, THOMAS J. DRUMMOND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

